Adjustable coal-boring auger.



c. N.' BARTON. ADJUSTABLE COAL BORINQAUGER.

APPLICATION FILED SEPT-14,1914- Patented Sept. 19, 1916.

INVENTOR:

ATTORNEY.

D STATES a'rnnr non.

CHARLES IN. BARTON, 0F INDIANAPOLIS, INDIANA, ASSIGNOR 0F ONE-HALF TOJ'AMES B. BLAGKMAN, 'OF HARRISBURG, ILLINOIS.

ADJUSTABLE COAL-BORING AUGER.

Specification of Letters Patent.

Application filed September 14, 1914. Serial N 0. 861,543.

To all whom it may concern:

Be it known that I, CHARLES N. BARTON, a citizen of the United States, residingiat Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Adjustable Coal-Boring Auger, of which the following is a specification, reference being had to the accompanying drawings and to the letters and figures of reference marked thereon.

This invention relates to an auger that is designed for boring or drilling holes of various diameters, more particularly for the use of coal miners whereby to bore the holes in the veins of coal to receive the blasting charges where the coal is loosened by blasting operations; An, object of the invention is to provide an auger that shall be so constructed that it may readily be resharpened and kept in working condition by the user, and by such means as maybe readily kept at hand.

Another object of the invention is to provide an adjustable coal-boring auger that may be resharpened and cared for by a miner, and "thereforebe economical and result in a large saving to the workman, and tend to bring about the elimination of the present practice of collecting fees from workmen by mine operators for dressing or sharpening drills and the like.

A still further object is to provide a coalboring auger of suchv construction as to be capable of readjustment for boring different diameters of holes.

With the above-mentioned and other objects in view, the invention consists in an improved bit head and also improved bits removably secured in the head and adapted to be repeatedly resharpened without requirmg the service of a professional or expert tool dresser; and the invention consists further in the parts, and combinations andarrangements of parts, as hereinafter particularly described and further defined in the accompanying claim.

Referring to the drawings,Figure 1 is an elevation, partially broken away, of a coal-boring auger constructed substantially in accordance with the invention; Fig. 2 is a longitudinal central section of the improved bit head and bits; Fig. 3 is a longitudinal central section on a plane at right angles to the plane of the section of the preceding figure; Fig. 4: is a fragmentary section approxspective view of one of the imately on the line A A on Fig. 1; Fig. 5 is a fragmentary elevation of the improved head and bits; Fig. 6 is an end view of the improved bit head; Fig. 7 is a section on the line B B on Fig. 1; and,'Fig. 8 is a perimproved cutting or reaming bits with which the improved head is provided.

Similar reference characters on the various figures of the drawings indicate like elements or features of construction herein referred to in, detail.

The improved bit head is adapted to be secured to a suitable shaft or auger body 1 which is twisted as iscustomary for working the borings out fromflthe hole being bored, one end of the bodyhaving a suitable shank 2 whereby to suitably rotate it, the opposite end having a tapered standard portion 3 whereby to carry and drive the improved bit head. p

The improved bit head comprises a main or' body portion 4: having a longitudinal Patented Sept. 19, 1916.

aperture 5 extending therethrough, the normal'upper portion of the aperture being tapered and adapted to receive the standard portion 3 which is removably secured in the aperture by a set screw 6 inserted in the wall of themain portion 4, the remaining portion of the aperture being oblong and rectangular transversely. The main portion 4 has spiral wings or blades 7 and 8 thereon adapted to keep the hole being bored clear of the borings. The wall of the main portion 4 is provided also with a set-screw 9 that extends to the aperture 5 at a suitable distance from the opposite or normal lower end of the main portion of the head. A twist drill 10 is provided which is composed of a fiat bar, being rectangular and oblong in cross-section and twisted and has a shank 11 thereon that is removably and adjustably inserted in the aperture 5 and secured therein by the set-screw 9, the drill having a suitable cutting or boring bit 12 on its end that is adapted to be resharpened either on a grindstone, or by means of a file when suitably tempered to permit filing it. The drill is adapted to serve as a pilot bit and may be of any desired convenient size. The bit head comprises also two wings 13 and 14 that extend divergently and have apertures 15 and 16 therein forming bottomless sockof reaming bits or boring bars 17 andm18 respectively, the bars being rectangular and oblong in cross-section and when-new extend ing entirely through the apertures, and the bars have curved lower portions 19 and 20 provided with cutting edges21 and 22 respectively. The bars extend downward and outward on opposite sides respectively of the pilot drill 10 so as to cut away the coal and enlarge the hole made by the drill. The bars 17 and 18 have shallow sockets 23 and 24 therein respectively, and also additional sockets 24 which receive the ends of set screws 25 and 26 with which the wings 13 and 14 are provided, the set screws firmly securing the bars in the apertures 15 and 16 respectively.

By reference to Fig. 7 particularly, it will be seen that the bars'17 and 18 are so arranged as to be on downwardly-converging planes on opposite sides of the axis of rotation of the pilot auger and extend downward diver-gently on the plane on which they are supported while the cutting bits extend downwardly and forward of a plane between the bodies of the bars, the set-screws 25 and 26 being on the normal forward sides of the Wings 13 and 14: respectively. It will be seen that when the bars are moved so as to be further projected, the diameter of the hole will be increased, and that the diameter will be decreased when the bars are moved inward in their sockets.

The improved anger is adapted to be retated to the right and may be suitably driven either by hand or by power. The coal not actually cut away by either the pilot drill or the cutting edges of the reaming bits is shaved 'ofi or broken away by 7 the inner edges of the curved portions 19 and 20. The sockets 24 and 24 are so spaced as to serve as indicators of the extent to which the bars are projected. When the cutting edges require resharpening this is readily done by the workman himself, and each bit may be resharpeneduntil it becomes too short for service and may then be replaced by a new one.

Having thus described the invention, what is claimed as new, is-

In an adjustable coal-boring auger, a bit head comprising a main portion having an aperture extending longitudinally therethrough the aperture being rectangular and oblong transversely and having a tapered upper portion, the aperture being adapted to receive the end of an auger body and also the shank of a pilot drill that is rectangular and oblong in cross-section, two wings fixed o'n'the main portion on opposite sides respectively of said aperture and having each a socket therein that is rectangul'ar and oblong transversely to receive a boring bar that is rectangular and oblong in 'cro'ss section, the sockets extending through the wings respectively, and two blades fixed on said main portion on.opposite portions respectively thereof and extending spirally from the normal upper "end of said portion approximately to and terminating near said wings.

In testimony whereof, aflix my signature in presence of two witnesses.

CHARLES N. BARTON.

Witnesses;

E; M. SPARROW.

Gobies of this patent may he obtained for live 'cents each, by addressing the Commissioner of Patents I Washington, D. 0. 

